From a9c641bc9dcca927cad8ee6bc53bd0cb31ef5b7f Mon Sep 17 00:00:00 2001
From: James Turk <james.p.turk@gmail.com>
Date: Mon, 1 Sep 2003 00:22:27 +0000
Subject: [PATCH] DrawClipped

---
 include/ZE_ZImage.h | 14 +++++++++++++-
 src/ZE_ZImage.cpp   | 38 +++++++++++++++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/include/ZE_ZImage.h b/include/ZE_ZImage.h
index c1ea002..a6c76e8 100644
--- a/include/ZE_ZImage.h
+++ b/include/ZE_ZImage.h
@@ -13,7 +13,7 @@
     \brief Definition file for ZImage.
 
     Definition file for ZImage, the OpenGL version of the ZImage class for ZEngine.
-    <br>$Id: ZE_ZImage.h,v 1.22 2003/08/07 05:54:45 cozman Exp $<br>
+    <br>$Id: ZE_ZImage.h,v 1.23 2003/09/01 00:22:27 cozman Exp $<br>
     \author James Turk
 **/
 
@@ -21,6 +21,7 @@
 #define __ze_zimage_h__
 
 #include "ZE_ZEngine.h"
+#include "ZE_ZRect.h"
 
 namespace ZE
 {
@@ -246,6 +247,17 @@ class ZImage
         **/
         void DrawRotated(float x, float y, float angle) const;
 
+        /*!
+            \brief Draw Clipped Image to screen.
+
+            Image is drawn such that only portions of image which fall within a certain area appear.
+            \since 0.8.5
+            \param x X coord to draw Image to.
+            \param y Y coord to draw Image to.
+            \param clipRect Rectangle to clip within.
+        **/
+        void DrawClipped(float x, float y, ZRect clipRect) const;
+
         /*!
             \brief Flip image over one or both axes.
 
diff --git a/src/ZE_ZImage.cpp b/src/ZE_ZImage.cpp
index 766db98..a7c86a8 100644
--- a/src/ZE_ZImage.cpp
+++ b/src/ZE_ZImage.cpp
@@ -13,7 +13,7 @@
     \brief Source file for ZImage.
 
     Implementation of ZImage, the Image class for ZEngine.
-    <br>$Id: ZE_ZImage.cpp,v 1.41 2003/08/08 03:52:25 cozman Exp $<br>
+    <br>$Id: ZE_ZImage.cpp,v 1.42 2003/09/01 00:22:35 cozman Exp $<br>
     \author James Turk
 **/
 
@@ -237,6 +237,42 @@ void ZImage::DrawRotated(float x, float y, float angle) const
     glPopMatrix();
 }
 
+void ZImage::DrawClipped(float x, float y, ZRect clipRect) const
+{
+    ZRect imgRect(x,y,rWidth,rHeight),inRect;
+    float xDiff,yDiff,nx,ny,nw,nh;
+    xDiff = rTexMaxX - rTexMinX;
+    yDiff = rTexMaxY - rTexMinY;
+
+    if(clipRect.Contains(imgRect))
+    {
+        Draw(x,y);
+    }
+    else if(clipRect.Intersects(imgRect))
+    {
+        inRect = clipRect.Intersection(imgRect);
+
+        nx = rTexMinX + (inRect.X()-imgRect.X())/imgRect.Width()*xDiff;
+        ny = rTexMinY + (inRect.Y()-imgRect.Y())/imgRect.Height()*yDiff;
+        nw = nx + (inRect.Width()/imgRect.Width())*xDiff;
+        nh = ny + (inRect.Height()/imgRect.Height())*yDiff;
+
+        glColor4ub(255,255,255,rAlpha); //sets the color correctly
+        Bind();
+        glBegin(GL_TRIANGLE_STRIP);
+            glTexCoord2f(nx,ny);    glVertex2f(inRect.Left(),inRect.Top());
+            glTexCoord2f(nw,ny);    glVertex2f(inRect.Right(),inRect.Top());
+            glTexCoord2f(nx,nh);    glVertex2f(inRect.Left(),inRect.Bottom());
+            glTexCoord2f(nw,nh);    glVertex2f(inRect.Right(),inRect.Bottom());
+        glEnd();
+        glColor4ub(255,255,255,255);    //be responsible, return to standard color state
+    }
+    else    //doesn't contain nor intersect
+    {
+        //draw nothing
+    }
+}
+
 void ZImage::Flip(bool horizontal, bool vertical)
 {
     GLfloat temp;